\input pstfig
\def\degrees{{}^{\raise 2pt\hbox{$\scriptscriptstyle\circ$}}}
\everypsbox{\sl}
\pspicture[-0.5](0,0)(4.7,3)
$
\pnode(0,0){A}
\pnode(5.6; 30){B}
\pnode(B|A){C}
\pspolygon(A)(B)(C)
\uput{1.5em}[17](O){30\degrees}
\noneline
\pcline(A)(B)
\Aput{2}
\pcline(A)(C)
\Bput{\sqrt{3\,}}
\pcline(B)(C)
\Aput{1}
$
\endpspicture
\pspicture(0,0)(3.8,4)
$
\pnode(0,0){A}
\pnode(5; 45){B}
\pnode(B|A){C}
\pspolygon(A)(B)(C)
\uput{1em}[25](O){45\degrees}
\noneline
\pcline(A)(B)
\Aput{\sqrt{2\,}}
\pcline(A)(C)
\Bput{1}
\pcline(B)(C)
\Aput{1}
$
\endpspicture
\pspicture(0,0)(5,3)
$
\pnode(0,0){A}
\pnode(5; 60){B}
\pnode(B|A){C}
\pspolygon(A)(B)(C)
\uput{0.8em}[30](O){60\degrees}
\noneline
\pcline(A)(B)
\Aput{2}
\pcline(A)(C)
\Bput{1}
\pcline(B)(C)
\Aput{\sqrt{3\,}}
$
\endpspicture
\bye
